<div class="menu-bar">
    <ul class="nav nav-pills">
        <li class="home"><a href="<?php echo $host; ?>/home"><span>Home</span></a></li>
        <li class="how-to"><a href="#"><span>How To Use</span></a></li>
        <li class="explore selected"><a style="background: #ecf0f1; color: #3f4e5d"href="<?php echo $host; ?>/explore"><span>Explore</span></a></li>
    </ul>
</div>